1. BROCK, F. W., and GIVNER, I. (1952). Arch. Ophthal. (Chicago), 47, 775.
2. CLARK, W. E. LE GROS (1941). J. Anat. (Lond.), 75, 419.
3. DYER, D., and BIERMAN, E. O. (1952). Amer. J. Ophthal., 35, 66.
4. HARMS, H. (1949). v. Graefes Arch. Ophthal., 149, 1. JoNEs, L. A., and HIGGINS, G. C. (1947). J. opt. Soc. Amer., 37, 217.
5. The Retina;POLYAK, S.L.,1941